<?php
class StringUtil{
	
	private static $chars = array("0","1","2","3","4","5","6","7","8","9",
				"A","B","C","D","E","F","G","H","I","J","K","L","M","N","O",
				"P","Q","R","S","T","U","V","W","X","Y","Z",
				"a","b","c","d","e","f","g","h","i","j","k","l","m","n","o",
				"p","q","r","s","t","u","v","w","x","y","z");
	
	public static function getRandomString($length){
		$chars = self::$chars;
		$max = count($chars) -1;
		$rdm=NULL;
		$i=NULL;
		$res = "";
		for($i=0;$i<$length;$i++){
			$rdm = rand(0, $max);
			$res .= $chars[$rdm];
		}
		return $res;
	}
}